Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.354..265l&link_type=abstract
In ESA, Targets for Space-Based Interferometry p 265-269 (SEE N93-31750 12-89)
Astronomy and Astrophysics
Astronomy
Angular Resolution, Astronomical Interferometry, Spaceborne Astronomy, Stellar Envelopes, Stellar Physics, Angular Velocity, B Stars, Binary Stars, High Resolution, Space Observations (From Earth)
Scientific paper
The physical processes at work in circumstellar envelopes at various distances from the star surface are discussed. The circumstellar envelopes appear as structures in which conditions determinant both for stellar and interstellar evolution take place. The angular resolution required to observe their effects is looked into and five examples which illustrate how increased angular resolution could improve knowledge about star envelopes are given. These examples concern evolved stars, Be stars, binary stars, luminous blue variables, and the Orion region. High angular resolution at large wavelengths already allows improved modelization of their inner layers, between the photosphere and the interstellar medium. However, the same spatial resolution cannot be reached at all wavelengths and this is an important drawback concerning the consistence of the mechanical, thermodynamical, chemical mechanisms invoked to explain the complex structures which involve many phenomena, on highly different time scales and size scales. It is concluded that space interferometry could open new doors towards domains in which ground observations are limited, like in the ultraviolet range.
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